fix systemd path in order to add compatibility with SuSe (#2499)

scripts/post-install.sh

@@ -11,7 +11,7 @@ function install_init {
 }
 
 function install_systemd {
-    cp -f $SCRIPT_DIR/telegraf.service /lib/systemd/system/telegraf.service
+    cp -f $SCRIPT_DIR/telegraf.service $1
     systemctl enable telegraf || true
     systemctl daemon-reload || true
 }
@@ -56,10 +56,10 @@ if [[ ! -d /etc/telegraf/telegraf.d ]]; then
 fi
 
 # Distribution-specific logic
-if [[ -f /etc/redhat-release ]]; then
+if [[ -f /etc/redhat-release ]] || [[ -f /etc/SuSE-release ]]; then
     # RHEL-variant logic
     if [[ "$(readlink /proc/1/exe)" == */systemd ]]; then
-        install_systemd
+        install_systemd /usr/lib/systemd/system/telegraf.service
     else
         # Assuming SysVinit
         install_init
@@ -73,7 +73,7 @@ if [[ -f /etc/redhat-release ]]; then
 elif [[ -f /etc/debian_version ]]; then
     # Debian/Ubuntu logic
     if [[ "$(readlink /proc/1/exe)" == */systemd ]]; then
-        install_systemd
+        install_systemd /lib/systemd/system/telegraf.service
         systemctl restart telegraf || echo "WARNING: systemd not running."
     else
 	    # Assuming SysVinit